City play the first of their six group games against Salzburg in Austria on Thursday night.
Roberto Mancini's men will want to bounce back after a Premier League defeat at Sunderland, and draw against Blackburn.
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Hart is expecting a tough game, but believes a food start could be crucial.
He said: 'We are in a very competitive group for qualification and in suchcircumstances getting off to the fastest of starts is important. Wecan't take anything for granted.
'It will not be easy, the place will be buzzing and Salzburg proved last year winning their title and their group in this competition that they are a decent side.
'We are determined to bounce back from the disappointment of dropping points at home, though I don't think we played badly at all.
'We have been solid defensively all season domestically and in the Europa League play-off and that is important when you go away from home in any competition.'
Salzburg were formidable in European competition twelve months ago, winning all six of their group games. Their run of success included two fine victories over Lazio.
They were knocked out by Standard Liege however, and bowed out of the Champions League earlier this term, after losing 4-3 on aggregate to Hapoel Tel Aviv.
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